H₂S-tolerant oxygen-permeable ceramic membranes for hydrogen separation with a performance comparable to those of palladium-based membranes

Abstract

We propose a new method for hydrogen separation using an oxygen-permeable ceramic membrane, and achieve a high hydrogen separation rate comparable to those of Pd-based membranes and excellent stability under a H2S-containing atmosphere.

Microstructural and Interfacial Designs of Oxygen‐Permeable Membranes for Oxygen Separation and Reaction–Separation Coupling

“…The combination of the selective oxidation of ethane to ethylene with the water decomposition reaction was also conducted in the hollow fiber membrane reactor . Recently, our group proposed two reaction–separation–reaction processes in MIEC membrane reactors for coproducing two types of syngas and hydrogen separation …”

“…In the previous investigations of water splitting in MIEC membrane reactors, if the driving force of the water decomposition reaction is provided by the hydrogen oxidation reaction, the whole process does not seem to warrant further study . However, the process using low‐purity hydrogen to produce high‐purity hydrogen can be operated as a process of hydrogen separation if steam is fed to side I while a low‐purity hydrogen source is introduced into side II ( Figure a) . The high‐purity hydrogen is obtained by cooling and drying the effluent gas of side I.…”

“…The concentration of H 2 to side I is 50% for the H 2 S concentration of 0–100 ppm and is 99.98% for the H 2 S concentration of 200 ppm. a–f) Reproduced with permission . Copyright 2017, Royal Society of Chemistry.…”

“…The hydrogen separation process was achieved on DP membranes with both surfaces covered with Ru or Ni catalysts to speed up the water‐splitting and hydrogen oxidation reactions (Figure b,c) . At 950 °C, the hydrogen separation rate was as high as 16 mL cm −2 min −1 (Figure d), which is 100–1000 times higher than those of mixed electronic–protonic conducting (MEPC) ceramic membranes.…”

High‐performance oxygen transport membrane reactors integrated with IGCC for carbon capture

“…In previous studies, many stable OTM materials were developed in these harsh conditions. Among them, OTMs, including BaCo x Fe y Zr 1−x−y O 3−δ , 32,33 La 0.9 Ca 0.1 FeO 3‐δ , 34 Ce 0.85 Sm 0.15 O 1.925 –Sm 0.6 Sr 0.4 Al 0.3 Fe 0.7 O 3‐δ , 35 Ce 0.85 Sm 0.15 O 1.925 –Sr 2 Fe 1.5 Mo 0.5 O 6‐δ , 36 and Ce 0.85 Sm 0.15 O 1.925 –Sm 0.6 Sr 0.4 Cr 0.3 Fe 0.7 O 3‐δ , 38 exhibited outstanding stabilities. These materials may be appropriate for H 2 production in the IGCC process.…”